Assertion `(A)` : All the `C` atoms of but-2-ene lie in one plane
Reason `(R )`: Double-bond `C` atoms are `sp^(2)`-hypbridised.
A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both the assertion and reason are true but the reason is not the correct explanation of assertion.
C. If the assertion is true but reason is false.
D. If assertion is false but reason is true.